- **blob** : A blob value represents a binary object. The internal encoding is transparent and not defined here. The binary object must be encoded conforming to [http://www.w3.org/TR/xmlschema-2/#base64Binary](http://www.w3.org/TR/xmlschema-2/#base64Binary) .

- **uri** : A URI that represents a Uniform Resource Identifier Reference (URI) as defined by as defined in [RFC 2396](http://www.ietf.org/rfc/rfc2396.txt) and amended in [RFC 2732](http://www.ietf.org/rfc/rfc2732.txt) .